diff --git a/usr.sbin/bhyve/acpi_device.c b/usr.sbin/bhyve/acpi_device.c
index 66d50de814fd..402e32faa93a 100644
--- a/usr.sbin/bhyve/acpi_device.c
+++ b/usr.sbin/bhyve/acpi_device.c
@@ -1,92 +1,137 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
  *
  * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
  * Author: Corvin Köhne <c.koehne@beckhoff.com>
  */
 
 #include <sys/param.h>
 #include <sys/queue.h>
 
 #include <machine/vmm.h>
 
 #include <err.h>
 #include <errno.h>
 #include <vmmapi.h>
 
 #include "acpi.h"
 #include "acpi_device.h"
 
 /**
  * List entry to enumerate all resources used by an ACPI device.
  *
  * @param chain Used to chain multiple elements together.
  * @param type  Type of the ACPI resource.
  * @param data  Data of the ACPI resource.
  */
 struct acpi_resource_list_entry {
 	SLIST_ENTRY(acpi_resource_list_entry) chain;
 	UINT32 type;
 	ACPI_RESOURCE_DATA data;
 };
 
 /**
  * Holds information about an ACPI device.
  *
  * @param vm_ctx VM context the ACPI device was created in.
  * @param name   Name of the ACPI device.
  * @param hid    Hardware ID of the ACPI device.
  * @param crs    Current resources used by the ACPI device.
  */
 struct acpi_device {
 	struct vmctx *vm_ctx;
 	const char *name;
 	const char *hid;
 	SLIST_HEAD(acpi_resource_list, acpi_resource_list_entry) crs;
 };
 
 int
 acpi_device_create(struct acpi_device **const new_dev,
     struct vmctx *const vm_ctx, const char *const name, const char *const hid)
 {
 	if (new_dev == NULL || vm_ctx == NULL || name == NULL || hid == NULL) {
 		return (EINVAL);
 	}
 
 	struct acpi_device *const dev = calloc(1, sizeof(*dev));
 	if (dev == NULL) {
 		return (ENOMEM);
 	}
 
 	dev->vm_ctx = vm_ctx;
 	dev->name = strdup(name);
 	dev->hid = strdup(hid);
 	SLIST_INIT(&dev->crs);
 	if (dev->name == NULL || dev->hid == NULL) {
 		acpi_device_destroy(dev);
 		return (ENOMEM);
 	}
 
 	*new_dev = dev;
 
 	return (0);
 }
 
 void
 acpi_device_destroy(struct acpi_device *const dev)
 {
 	if (dev == NULL) {
 		return;
 	}
 
 	struct acpi_resource_list_entry *res;
 	while (!SLIST_EMPTY(&dev->crs)) {
 		res = SLIST_FIRST(&dev->crs);
 		SLIST_REMOVE_HEAD(&dev->crs, chain);
 		free(res);
 	}
 	
 	free(__DECONST(void *, dev->hid));
 	free(__DECONST(void *, dev->name));
 	free(dev);
 }
+
+int
+acpi_device_add_res_fixed_ioport(struct acpi_device *const dev,
+    const UINT16 port, const UINT8 length)
+{
+	if (dev == NULL) {
+		return (EINVAL);
+	}
+
+	struct acpi_resource_list_entry *const res = calloc(1, sizeof(*res));
+	if (res == NULL) {
+		return (ENOMEM);
+	}
+
+	res->type = ACPI_RESOURCE_TYPE_FIXED_IO;
+	res->data.FixedIo.Address = port;
+	res->data.FixedIo.AddressLength = length;
+
+	SLIST_INSERT_HEAD(&dev->crs, res, chain);
+
+	return (0);
+}
+
+int
+acpi_device_add_res_fixed_memory32(struct acpi_device *const dev,
+    const UINT8 write_protected, const UINT32 address, const UINT32 length)
+{
+	if (dev == NULL) {
+		return (EINVAL);
+	}
+
+	struct acpi_resource_list_entry *const res = calloc(1, sizeof(*res));
+	if (res == NULL) {
+		return (ENOMEM);
+	}
+
+	res->type = ACPI_RESOURCE_TYPE_FIXED_MEMORY32;
+	res->data.FixedMemory32.WriteProtect = write_protected;
+	res->data.FixedMemory32.Address = address;
+	res->data.FixedMemory32.AddressLength = length;
+
+	SLIST_INSERT_HEAD(&dev->crs, res, chain);
+
+	return (0);
+}
diff --git a/usr.sbin/bhyve/acpi_device.h b/usr.sbin/bhyve/acpi_device.h
index 1728acd4cdcd..d9618d7e0a43 100644
--- a/usr.sbin/bhyve/acpi_device.h
+++ b/usr.sbin/bhyve/acpi_device.h
@@ -1,31 +1,36 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
  *
  * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
  * Author: Corvin Köhne <c.koehne@beckhoff.com>
  */
 
 #pragma once
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-parameter"
 #include <contrib/dev/acpica/include/acpi.h>
 #pragma GCC diagnostic pop
 
 struct vmctx;
 
 struct acpi_device;
 
 /**
  * Creates an ACPI device.
  *
  * @param[out] new_dev Returns the newly create ACPI device.
  * @param[in]  vm_ctx  VM context the ACPI device is created in.
  * @param[in]  name    Name of the ACPI device. Should always be a NULL
  *                     terminated string.
  * @param[in]  hid     Hardware ID of the ACPI device. Should always be a NULL
  *                     terminated string.
  */
 int acpi_device_create(struct acpi_device **const new_dev,
     struct vmctx *const vm_ctx, const char *const name, const char *const hid);
 void acpi_device_destroy(struct acpi_device *const dev);
+
+int acpi_device_add_res_fixed_ioport(struct acpi_device *const dev,
+    const UINT16 port, UINT8 length);
+int acpi_device_add_res_fixed_memory32(struct acpi_device *const dev,
+    const UINT8 write_protected, const UINT32 address, const UINT32 length);